The author of this tutorial is Nur Roy. He writes:
"If you take a photo under dim light, there is a good chance you will have noise on your image. Sometimes our digital images look dirty, not good for printing because of noise problems. No one likes to print fuzzy images.
However you can still save these images by using noise removal software.
In this example I used AKVIS Noise Buster, an Adobe PhotoShop compatible plug-in.
Click on the images to open larger variants
I set the Shadows/Highlights settings to Shadows = 50%, Highlights = 10%.
There are two types of noise on images. Luminance noise, which appears as various grainy pixels, and chroma (color) noise. Color noise can be seen as random red and blue pixels on the image.
AKVIS Noise Buster reduces both luminance and color noise on digital images.
I chose the AKVIS Noise Buster plug-in from the Filter menu. When you click on the plug-in, it opens the image within its own window.
When AKVIS Noise Buster makes changes to a large photo, it works a bit slowly, but that can be expected for the amount of work.
Next press to apply the changes.
Here you can you can see how the photo looks after processing.
In my opinion AKVIS Noise Buster software is easy to use and worth buying in order to save your bad looking photos!"